CN1905648A - Tuning method for digital television receiver - Google Patents
Tuning method for digital television receiver Download PDFInfo
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- CN1905648A CN1905648A CN 200510028325 CN200510028325A CN1905648A CN 1905648 A CN1905648 A CN 1905648A CN 200510028325 CN200510028325 CN 200510028325 CN 200510028325 A CN200510028325 A CN 200510028325A CN 1905648 A CN1905648 A CN 1905648A
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- tuning
- television receiver
- digital television
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Abstract
The invention relates to a tuning method of the digital television receiver including: 1, when the power is on, the digital TV receiver generates a benchmark frequency of relevant channels according to the channel-information stored before power was off last time, and then it starts migration-scanning in the left and right directions in turns to search for the carrier-waves, 2, after scanning, the migration is set to be the basic scanning information and stored in the other memorizer, 3, the carrier-waves of channel are scanned and tuned only in the benchmark-direction according to the basic scanning migration information.
Description
Technical field
The invention relates to and a kind ofly carry out searching carrier, reduce the unnecessary searching carrier time, make the tuning methods of a kind of digital television receiver that tuned speed is improved in left and right sides direction skew.
Background technology
Usually, as shown in Figure 1, the tuning methods of digital television receiver is realized by following process:
S100, according to user's button operation, select fixed channel carry out tuning.
S101 produces the PLL value corresponding with the centre frequency of channel correlation then.
S102 as benchmark, takes turns to be offset in left and right sides direction (Zig-Zag scanning).
S103, the carrier wave of search channel correlation.
S104 under the situation of fixed condition, locks (locking) this carrier wave satisfying.To this, illustrate in greater detail with reference to Fig. 2.
As shown in Figure 2, existing digital television receiver tuning methods is as follows: the television carrier frequency CF (Carrier Frequency) with channel correlation is a benchmark, carry out tuning on the left and right sides direction in setpoint frequency interval (Δ x) repeatedly, for example, position with " 0 " is a benchmark ,+1 ,-1 ,+2 ,-2 ... carry out tuning offset repeatedly on the left and right sides direction in the scope, after detecting the residing channel frequency of channel correlation carrier wave, be locked, realize tuning.
But, owing to realize that usually the offset direction of the carrier frequency search of particular satellite relay base is specific (left direction or right direction), searching carrier when so two side directions are offset to the left and right, just expended the unnecessary searching carrier time, reduced tuned speed, especially take place because channel alteration when causing the so inevitable situation of time delay in digital broadcast, original existing defective of tuning methods just seemed more obvious.
Summary of the invention
In order to address the above problem, the present invention arises at the historic moment.The objective of the invention is to provide a kind of on a left side/right two side directions, be offset in, carry out searching carrier, reduce the unnecessary searching carrier time with this, thereby make the tuning methods of a kind of digital television receiver that tuned speed promoted.
In order to achieve this end, the tuning methods of digital television receiver of the present invention utilizes the offset direction of carrier frequency to keep certain characteristic on specific direction, initial stage when power supply will be opened (ON) carries out when tuning, store its offset direction, from ensuing tuning, utilize the offset direction information of its storage, carrier wave is searched for, shorten the searching carrier time with this, improve channel tuning speed.
For this reason, the present invention realizes the tuning of digital television receiver by following process:
The 1st process, after the power supply of opening (ON) digital television receiver, utilize the stored before channel information of digital television receiver power-off (OFF), produce the reference frequency of channel correlation, by take turns to be offset (Zig-Zag) scanning in left and right sides direction, carrier wave is searched for;
The 2nd process in above-mentioned the 1st process, when having searched for the carrier wave of channel correlation, is fixed scanning shift reference direction information with the scanning shift direction setting of searching carrier, and it is stored in other memories;
The 3rd process, through after above-mentioned the 2nd process, produce during fixed channel tuning, utilize the scanning shift reference direction information that stores in above-mentioned the 2nd process, only on reference direction, the carrier wave of channel correlation is searched for tuning.
And above-mentioned the 3rd process realizes by following three processes:
The 3-1 process after the 2nd above-mentioned process, when deciding channel tuning when having selected, produces the reference frequency of channel correlation, in addition, reads scanning shift reference direction information stored in above-mentioned the 2nd process;
The 3-2 process is the center with the reference frequency that produces in the above-mentioned 3-1 process, utilizes the scanning shift reference direction information that reads in the 3-1 process, searching carrier on relevant reference direction;
The 3-3 process when finishing searching carrier in the above-mentioned 3-2 process, is carried out carrier lock (locking), tuning fixed channel.
Effect of the present invention:
As mentioned above, the tuning methods of digital television receiver of the present invention, utilize the offset direction of carrier frequency on specific direction, to keep certain characteristic, initial stage when power supply will be opened (ON) carries out storing its offset direction, from ensuing tuning when tuning, utilize the offset direction information of its storage, to the carrier wave search, thereby reach shortening searching carrier search time, improved the effect of channel tuning speed.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the accompanying drawing that shows existing digital television receiver tuning methods.
Fig. 2 is the accompanying drawing that the tuning methods to Fig. 1 is described in further detail.
Fig. 3 shows the accompanying drawing that has adopted digital television receiver of the present invention for example.
Fig. 4 is the accompanying drawing that shows digital television receiver tuning methods of the present invention.
The symbol description of major part in the accompanying drawing:
The 100:LNB device
111: tuner
112:QPSK polyphony device
The 113:A/D transducer
114:Viterbi decoder (Viterbi decoder)
115: deinterlacing processor (Deinterleaver)
116:Reed-Solomon polyphony device
117: decoder (Descrambler)
121: demultiplexer (Demultiplexer)
122: audio decoder (Audio Decoder)
123: Video Decoder (Vedio Decoder)
130: microcomputer
140: flash memory
150: look-up table (LUT)
Embodiment
Following with reference to accompanying drawing, the execution mode of the tuning methods of digital television receiver of the present invention is elaborated.
At first, the digital television receiver that has adopted tuning methods of the present invention is illustrated with reference to Fig. 3.
In a part of pie graph of the digital television receiver that above-mentioned Fig. 3 shows, tuning methods of the present invention is as follows, at first tuner 111 is after the power supply of opening (ON) digital television receiver, under the control of microcomputer 130, utilize digital television receiver power-off (OFF) to be stored in channel information in the flash memory 140 before, produce the PLL value corresponding with the reference frequency of channel correlation, utilization takes turns to be offset (Zig-Zag scanning) (zig-zag scanning) in left and right sides direction, by LNB device 100, the carrier wave that will receive is searched for.
Then, microcomputer 130 is in tuner 111 search channel correlation carrier waves, with the scanning shift direction setting of searching carrier by fixed scanning shift reference direction information storage in other memory (particularly can carry out the look-up table (LUT) 150 of Set/Reset), and make scanning shift reference direction information just carry out Set/Reset at digital television receiver power supply opening (ON) initial stage.
Then, from according to user order fixed channel tuning, tuner 111 utilizes the scanning shift reference direction information that is stored in the look-up table (LUT) 150 under the control of microcomputer 130, on reference direction the carrier wave of channel correlation is searched for tuning.Promptly, order according to the user, above-mentionedly decide channel and carry out when tuning having selected, tuner 111 produces under the control of microcomputer 130 and the corresponding PLL value of channel correlation reference frequency, and read the scanning shift reference direction information that is stored in the above-mentioned look-up table 150, with the reference frequency is the center, utilize above-mentioned scanning shift reference direction information, searching carrier on relevant reference direction, then, when having searched for carrier wave, carry out carrier lock (locking), to fixed channel carry out tuning, then, utilize 2nd oscillator of tranmitting frequency, carry out carrier wave and recover (carrier recovery) and clock recovery (clock recovery) for 479.5MHZ.
After tuning finishing, till carrying out multiplexed (Multiplexing), the process during this is as follows.
Promptly, adopted the i/q signal of 112 pairs of inputs of QPSK polyphony device of right angle phase migration mode (QPSK:Quadrature Phase Shift Keying) to carry out polyphony, A/D converter 113 becomes digital signal with the I/Q analog signal conversion of input, and 114 pairs of i/q signals that convert digital signal to of Viterbi decoder (decoder) are decoded.Then, deinterlacing processor (Deinterleaver) 115 reduction intersections change, and make when appearance group (burst) or byte (byte) mistake, error are dropped to minimum.Read-Solomon polyphony device 116 is after having carried out the Read-Solomon decoding, utilize 16 check digit (Parity Bit), with the error correction that produced in the reception/transmission information to 8Bit, when being sent in decoder (Descrambler) 117 with packets of information (Packet) unit it, only can impact in order to make information transmitting apparatus in Date Bit, produce a mistake relevant Bit, need to recover to have carried out the irregular ENERGY diffusion of Scramble, and be sent to demultiplexer with packets of information (Packet) unit.
At last, the data flow of above-mentioned packets of information (Packet) unit is carried out multiplexed in demultiplexer 121, and decoding respectively in audio decoder 122 and Video Decoder 123, output audio and vision signal, this audio frequency and vision signal processing procedure belong to well-known technology, will no longer go to live in the household of one's in-laws on getting married at this and tell.
Equally, the tuning methods of digital television receiver of the present invention has utilized the offset direction of carrier frequency to keep certain characteristic on specific direction, initial stage when power supply will be opened (ON) carries out when tuning, store its offset direction, from ensuing tuning, utilize the offset direction information of its storage, carrier wave is searched for, shorten the searching carrier time with this, improve channel tuning speed.
Below with reference to Fig. 4, be described in more detail with regard to digital television receiver tuning methods of the present invention.
As shown in Figure 4:
S400, S401, whether the tuning methods of digital television receiver of the present invention is at first opened (ON) to the digital television receiver power supply and is judged.
S402, at power supply opening (ON) afterwards, search in memory (EEPROM).
S403 reads the stored before channel information of correlated digital television receiver power-off (OFF).
S404, S405, the reference frequency of generation channel correlation is by taking turns to be offset (Zig-Zag) scanning, searching carrier in left and right sides direction.
S406, then, search has or not the carrier wave of channel correlation.
Can S407 judge and lock setting to it after searching the carrier wave of channel correlation.
S408, S409, if can carry out carrier lock (), the scanning shift direction setting during with searching carrier is fixed scanning shift reference direction information, and is stored in other the memory.At this moment, it is stored in the look-up table (LUT) that can carry out Set/Reset, makes scanning shift reference direction information just can obtain Set/Rreset at digital television receiver power supply opening (ON) initial stage.
Like this, carry out institute when deciding channel tuning as the user later on, utilize the scanning shift reference direction information that stores among the step S409, only need on reference direction, search for tuning the carrier wave of channel correlation.
S410 promptly, after having passed through step S409, according to user's button operation, judges whether the user selects channel tuning.
S411, S12, when the user select when deciding channel, produce the PLL value corresponding with the reference frequency of channel correlation, in addition, read in the scanning shift reference direction information that stores among the step S409.
S413 is the center with the PLL value of the reference frequency that produces among the step S411, utilizes the scanning shift reference direction information that reads among the step S412, searching carrier on corresponding reference direction.
S414, S415, then, when searching carrier wave (, can judgement be carried out carrier lock (locking) and set.
S416 according to its result of determination, carries out carrier lock, tuningly decides channel, execution in step S410 then, end the present invention.
Generally speaking, the tuning methods of digital television receiver of the present invention, utilize the offset direction of carrier frequency on specific direction, to keep certain characteristic, initial stage when power supply will be opened (ON) carries out storing its offset direction, from ensuing tuning when tuning, utilize the offset direction information of its storage, carrier wave is searched for, shortened the searching carrier time, improve channel tuning speed with this.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (3)
1, a kind of tuning methods of digital television receiver is characterized in that comprising following process:
The 1st process, after opening the power supply of digital television receiver, utilize digital television receiver power-off stored channel information before, produce the reference frequency of channel correlation, by taking turns to carry out shifted scanning, carrier wave is searched in left and right sides direction;
The 2nd process in described the 1st process, when having searched for the carrier wave of channel correlation, by being decided scanning shift reference direction information, and is stored in the scanning shift direction setting of searching carrier in other memories with it;
The 3rd process, through after described the 2nd process, produce during fixed channel tuning, utilize the scanning shift reference direction information that stores in described the 2nd process, only on reference direction, the carrier wave of channel correlation is searched for tuning.
2, the tuning methods of digital television receiver as claimed in claim 1 is characterized in that described the 3rd process realizes by following three processes:
The 3-1 process after described the 2nd process, when deciding channel tuning when having selected, produces the reference frequency of channel correlation, in addition, reads scanning shift reference direction information stored in described the 2nd process;
The 3-2 process is the center with the reference frequency that produces in the described 3-1 process, utilizes the scanning shift reference direction information that reads in the 3-1 process, searching carrier on relevant reference direction;
The 3-3 process when finishing searching carrier in the described 3-2 process, is carried out carrier lock, tuning fixed channel.
3, the tuning methods of digital television receiver as claimed in claim 1 or 2 is characterized in that described scanning shift reference direction information just can be provided with/reset at the digital television receiver power supply opening initial stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510028325 CN1905648A (en) | 2005-07-29 | 2005-07-29 | Tuning method for digital television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510028325 CN1905648A (en) | 2005-07-29 | 2005-07-29 | Tuning method for digital television receiver |
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| Publication Number | Publication Date |
|---|---|
| CN1905648A true CN1905648A (en) | 2007-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510028325 Pending CN1905648A (en) | 2005-07-29 | 2005-07-29 | Tuning method for digital television receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014253A (en) * | 2010-11-24 | 2011-04-13 | 深圳创维－Rgb电子有限公司 | Channel searching method and device and television set |
| CN108259980A (en) * | 2017-12-29 | 2018-07-06 | 伟乐视讯科技股份有限公司 | A kind of dynamic signal search method |
-
2005
- 2005-07-29 CN CN 200510028325 patent/CN1905648A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014253A (en) * | 2010-11-24 | 2011-04-13 | 深圳创维－Rgb电子有限公司 | Channel searching method and device and television set |
| CN108259980A (en) * | 2017-12-29 | 2018-07-06 | 伟乐视讯科技股份有限公司 | A kind of dynamic signal search method |
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